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Understanding Invasive Species and Their Impact on Ecosystems

Invasive species pose a serious threat to the environment by disrupting native ecosystems. They are animals or plants introduced to a new habitat that outcompete native species, leading to devastating effects. The article highlights examples such as European rabbits damaging crops worldwide and red deer causing deforestation in South America. Efforts to control these invaders face challenges, emphasizing the complex nature of ecological changes.

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Understanding Invasive Species and Their Impact on Ecosystems

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  1. Eng101 First Semester Unit 5: Natural World 5.2 INVASION

  2. Eng. 101 Unit 5 -lesson 2: INVASION OBJECTIVES By the end of the lesson, you will be able to • extract information from a text. • recognise words that are used as both nouns and verbs. • revise and practice some quantifiers. • write a paragraph about your own life.

  3. Think! 1. What does the verb “invade” mean? Invade means to enter a place in large numbers, usually when unwanted and in order to take possession or do damage. 2. How does the noun “ invader” make you feel? scared, angry, insecure, nervous …etc 3. Do you know some names of some invasive species? ants, spiders, weevils, slugs and snails, rats, crickets etc. Eng. 101 Unit 5 -lesson 2: INVASION

  4. Read the following questions before moving to the reading on the following slide. 1. The purpose of the article is to … a. talk about the problems that new animals face in new environments. b. talk about how animal invaders that affect local ecosystems. c. talk about the natural environment southern Europe . 2. What are invasive species? _______________________________________________________________________________________ 3. What is special about the European rabbit? _______________________________________________________________________________________ 4. What’s the danger that is threatening red squirrels? _______________________________________________________________________________________ 5. The pronoun ‘their’ in the 2ndparagraph refers to: _______________________________________________________________________________________ Eng. 101 Unit 5 -lesson 2: INVASION

  5. Read the article magazine below and answer the questions that you had on the previous slide. Animal invaders Many agree that invasive species are a real environmental threat. Invasive species are animals or plants that are brought to a new habitat and attack the native species to the point where many of these latters can’t survive. Invasive species are usually hardier, more demanding and reproduce much faster. Animal invaders can have various effects on the local ecosystem. In the natural world, there are many animal invaders that can have various effects on the local ecosystem. They destroy plants and harm the economy. For example, the European rabbit was living happily in southern Europe when suddenly brought to all continents except Antarctica and Asia. Rabbits reproduce very quickly. Their population numbers grow so large and they eat the farmers’ crops all over the world. Another example is the red deer that were living in Europe, and then brought to South America. Red deer are considered invasive species because they are destroying the forest as they eat the little trees. Some animal invaders cause extinctions such as the grey squirrels. They were living in North America and were brought to England as pets. These pets escaped in the wild and ate the same food as the red squirrels which are originally living in England, as a result red squirrels face extinction. For many reasons the number of animal invaders is increasing and many countries try to control the situation. However, it seems difficult for us to stop changes because changes are always part of nature. Eng. 101 Unit 5 -lesson 2: INVASION

  6. Now, check your answers. 1. The purpose of the article is to … a. talk about the problems that new animals face in new environments. √ b. talk about how animal invaders that affect local ecosystems. c. talk about the natural environment southern Europe . 2. What are invasive species? Invasive species are animals or plants that are brought to a new habitat and attack the native species. _______________________________________________________________________________________ 3. What is special about the European rabbit? They reproduce very quickly. They damage farmers’ crops all over the world. _______________________________________________________________________________________ 4. What’s the danger that is threatening red squirrels? The red squirrels face extinction. _______________________________________________________________________________________ 5. The pronoun ‘their’ in the 2ndparagraph refers to : _______________________._ Their refers to rabbits Eng. 101 Unit 5 -lesson 2: INVASION

  7. Read the article again and complete the table below. Animal origin Place of invasion Problem rabbits red deer grey squirrels Eng. 101 Unit 5 -lesson 2: INVASION

  8. Check your answers. Animal place of origin Place of invasion Problem All over the world the world except Antarctica and Asia rabbits Europe They eat farmers’ crops. Europe South America They eat young trees. red deer They eat the same food  as the native red squirrel.  The read squirrel faces extinction. North America England grey squirrels Eng. 101 Unit 5 -lesson 2: INVASION

  9. Think! Is the word “damage” in the following sentences a verb or a noun? Why? 1. Grey squirrels don’t damage the economy.  It’s a verb because a verb must follow “don’t”. 2. The red deer cause a lot of damage to the forest in South America?  It’s a noun because a noun follows “a lot of”. Eng. 101 Unit 5 -lesson 2: INVASION

  10. Let’s look closer!  Many words can be both nouns and verbs, without any change in the form.  There are many words in the English language that can be both nouns and verbs such as : cause – harm - plant – change – control Let’s practice! Scan the article “Animal invader” on slide 5. Find the nouns stated above in the text and decide whether they are nouns or verbs?  They destroy plants and harm the economy. Plants: noun – Harm: verb ……………………………………………………………………………………………………….......... verb  Some animal invaders cause extinctions such as the grey squirrels. ……………………………………………………………………………………………………….......... verb ………………………………………………………………………………………………………..........  Many countries try to control the situation. noun  It seems difficult for us to stop changes because changes are always part of nature. ……………………………………………………………………………………………………….......... Eng. 101 Unit 5 -lesson 2: INVASION

  11. Are the words in the box below countable (C) or uncountable (U)? With which can you use a/an/the? Which one has a plural form? cause – harm - plant – change – control - damage countable countable 1. cause:……………………………….….......... 2. harm: …………………………………….......... 3. plant :…………………………………..…..... countable 4. change :…………………………………..... countable 5. control :………………………………..... countable 6. damage :……………………………………..... uncountable  We use “a/an” with countable nouns and “the” with countable and uncountable nouns.  We have plural forms with countable nouns. Eng. 101 Unit 5 -lesson 2: INVASION

  12. Which of these words and phrases mean a large quantity/number/amount, and which mean the opposite? few few a lot of little much a little several many a lot of , many and much. 1. A large quantity/number/amount:…………………………………………………………………….. few, little, a few, a little and several. 2. A small quantity/number/amount:………………………………………………………………………  Use “a lot of, many and much” to talk about a large quantity or an amount.  You use “many” with countable plural nouns and “much” with uncountable nouns. Rule: Example: Many animals are in danger because there isn’t much food for them.  Use “few, little, a few, a little and several” to talk about a small quantity and amounts.  You use “few/ a few” with countable plural nouns and “little/ a little” with uncountable nouns. Rule: Example: There are few tigers in the world. There’s little hope for animals. Eng. 101 Unit 5 -lesson 2: INVASION

  13. little, a little, few, a few  little and (a) few are quantifiers meaning ‘some’. Little and few have negative meanings.  We use them to mean ‘not as much as may be expected or wished for’. All she wanted was a few moments on her own. ===== some, a small number She had few moments on her own. ===== not many/ almost non  She saves a little money every month. ===== some, a small amount  They had little money to spend. ===== not much/ almost nothing Eng. 101 Unit 5 -lesson 2: INVASION

  14. Rules  “A lot of” can be used with both countable & uncountable nouns. Example: A lot of animals are in danger because there isn’t a lot of food for them.  “few, several , many” are used with countable nouns.  “ little, much” are used with uncountable nouns. It is quite formal to use many in affirmative sentences. In informal English you use a lot of. Example: There are many grey squirrels in UK. I have a lot of squirrels in my garden.  You don not usually use few and little with questions and negative sentence. Negative: We haven't got many trees in the garden. Questions: Is there much rain in the desert?  “Many” is used in both affirmative and negative statements.  use “much” in negative statements. Example: There are many grey squirrels in UK, but there aren’t many red squirrels now. Eng. 101 Unit 5 -lesson 2: INVASION

  15. Are these statements true(T) or false (F)? 1. You never use much in questions. T F 2. You often use many in positive sentences. T F 3. You don’t usually use much in positive sentences. T F 4. You never use much in negative sentences. T F 5. You can use many in questions and negative sentences. T F Eng. 101 Unit 5 -lesson 2: INVASION

  16. Check your answers. 1. You never use much in questions. T F 2. You often use many in positive sentences. T F 3. You don’t usually use much in positive sentences. T F 4. You never use much in negative sentences. T F 5. You can use many in questions and negative sentences. T F Eng. 101 Unit 5 -lesson 2: INVASION

  17. Complete the following sentences with much, many, a lot of , little or few. much 1. We’ll have to hurry. We haven’t got …………………. time. 2. ……………………. people do not like flying. Many 3. It costs me …………….. money to furnish this house. a lot of few 4. He has very ………….. friends. little 5. Hurry! We’ve got ………….. time. Eng. 101 Unit 5 -lesson 2: INVASION

  18. Writing Write a paragraph about the wildlife in your country and your lifestyle. Use the quantifiers (many ,little ,few, much, a lot of), the words and the phrases below. - free time - friends - books and TV - cinema - environmental problems - dangerous animals Example: In my country, there aren’t many dangerous animals. ………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………… ………………………………………………………………………………………………………………………… ……………………………………………………..…………………………………………………………………… Eng. 101 Unit 5 -lesson 2: INVASION

  19. A suggested answer In my country, there aren’t many dangerous animals. I’m lucky that we don’t have such animals around as this can make our life a bit risky. But, I do love watching documentaries about animals, mainly the wild ones. I like learning about these animals, we don’t have many dangerous animals in Bahrain ,but the few that we have are in captivity in Al Areen Natural Reserve. So, whenever I feel like seeing real wild and dangerous animals, I just join my family or call my best friends and go there for a great outing. In some desert areas in Bahrain we have wild animals like Jerboa - which looks like a rat but with long rear legs – and a type of spiny-tailed lizard that live mainly in Sakhir which is a desert in the middle of Bahrain, where people usually go camping there in winter. Eng. 101 Unit 5 -lesson 2: INVASION

  20. Thank you for your attention

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